In a large mixer bowl cream together white sugar, 1/2 cup butter, eggs and chocolate syrup. Add flour and salt. Beat until smooth.

Pour batter into the prepared pan. Bake for 25 to 30 minutes or until top springs back when lightly touched. Cool completely in pan then spread with Mint Cream. Chill, then pour Chocolate Topping over chilled brownies. Cover and chill for at least 1 hour.

To Make Mint Cream: In a small mixer bowl combine the confectioners' sugar, 1/2 cup butter or margarine and mint extract. Beat until smooth.

To Make Chocolate Topping: In a small saucepan over very low heat or double boiler melt the butter and the chocolate chips. Remove from heat and stir until smooth. Let cool slightly before spreading over brownies.